Color-photographic recording material

ABSTRACT

Compounds of the formula I ##STR1## in which X is a group ##STR2## and R 1 , R 2 , R 3 , R 4  and R 5  are monovalent organic radicals, at least one of which contains a sterically hindered phenol group and at least one of which contains a polyalkylpiperidine group, are outstanding light stabilizers for color-photographic recording materials. They also have a stabilizing action on the photo dyes and their precursors when stored in the dark.

The present invention relates to a colour-photographic recording material containing, as a stabiliser, a specific heterocyclic compound in at least one light-sensitive silver halide emulsion layer and/or in at least one of the conventional auxiliary layers. These compounds are isocyanuric acid derivatives or barbituric acid derivatives, the molecule of which contains both a sterically hindered phenol group and a polyalkylpiperidine group.

Molecules which combine sterically hindered phenols and polyalkylpiperidines and which can be used as stabilisers for colour-photographic materials are already known from European Pat. No. A 11,051. These are polyalkylpiperidinyl esters of hydroxybenzylmalonic acids. In following up this research work further it has been found that certain heterocyclic compounds containing sterically hindered phenol groups and piperidine groups also possess an excellent light-stabilising action for colour photographs and, in addition, also stabilise the dyes in the dark against changes which occur when the recording material is stored.

The present invention relates, therefore, to a colour-photographic recording material which, in at least one light-sensitive silver halide emulsion layer, one intermediate layer, one image-receiving layer and/or one protective layer, contains, as a stabiliser, at least one compound of the formula I ##STR3## in which X is a group ##STR4## and R¹, R², R³, R⁴ and R⁵ are monovalent organic radicals, at least one of which contains a sterically hindered phenol group and at least one of which contains a polyalkylpiperidine group.

These stabilisers are, in particular, compounds of the formula I in which X is a group --N(R³)-- or --C(R⁴) (R⁵)--, R¹, R² and R³ independently of one another are either (a) a group of the formula II ##STR5## in which R⁶ is hydrogen, C₁ -C₈ -alkyl, C₅ -C₈ -cycloalkyl, C₇ -C₉ -phenylalkyl, phenyl or C₇ -C₁₀ -alkylphenyl, R⁷ is C₁ -C₈ -alkyl, C₅ -C₈ -cycloalkyl, C₇ -C₉ -phenylalkyl, phenyl or C₇ -C₁₀ -alkylphenyl, and R⁸ is hydrogen or methyl, or (b) a group of the formula III or IV

    --C.sub.m H.sub.2m --CO--Y--D                              (III)

    --C.sub.m H.sub.2m --CO--O--C.sub.n H.sub.2n --E           (IV)

in which m is 1-4 and n is 2-5, Y is --O-- or --NR⁹ -- and R⁹ is hydrogen, C₁ -C₁₂ -alkyl, C₅ -C₁₂ -cycloalkyl, C₃ -C₁₂ -alkoxyalkyl, C₄ -C₁₂ -dialkylaminoalkyl or a group of the formula ##STR6## in which p is 2-12, or R⁹ is D, D is a group of the formula V, VI or VII ##STR7## and E is a group of the formula VIII ##STR8## in which R is hydrogen or methyl, R¹⁰ is hydroxyl, C₁ -C₁₂ -alkyl, C₃ -C₆ -alkenyl, C₃ -C₄ -alkinyl, C₇ -C₁₂ -phenylalkyl, glycidyl, C₁ -C₄ -alkyl which is substituted by halogen, --CN, --COOR¹⁵ or --CON(R¹⁶)(R¹⁷), or a group --CO--R¹⁸ --CO--OR¹⁵, --CO--N(R¹⁶ (R¹⁷), --CH₂ --CH(R¹⁹)--OR²⁰, --SO--R²¹, --SO₂ --R²¹, --OR¹⁵ or --OOC--R¹⁸, R¹¹ is methyl or ethyl, R¹² is hydrogen, --OR²², --OOC--R¹⁸ or --N(R⁹)--CO--R¹⁸ and R¹³ is hydrogen, --CN, --COOR¹⁵ or --CONH₂ or R¹² and R¹³ together form a group of the following formulae ##STR9## R¹⁵ is C₁ -C₁₂ -alkyl, allyl, benzyl or cyclohexyl, R¹⁶ is C₁ -C₁₂ -alkyl, allyl, cyclohexyl, benzyl or phenyl, and R¹⁷ is hydrogen or C₁ -C₈ -alkyl, or R¹⁶ and R¹⁷, together with the N atom, are a 5-membered or 6-membered heterocyclic ring, R¹⁸ is hydrogen, C₁ -C₁₂ -alkyl, C₂ -C₆ -alkenyl, chloromethyl, C₅ -C₁₂ -cycloalkyl, C₇ -C₁₂ -phenylalkyl, phenyl, C₇ -C₁₀ -alkylphenyl or phenyl, phenylmethyl or phenylethyl which is substituted by one or two C₁ -C₄ -alkyl groups and a hydroxyl group, R¹⁹ is hydrogen, C₁ -C₄ -alkyl, C₂ -C₁₃ -alkoxymethyl, phenyl or phenoxymethyl, R²⁰ is hydrogen, C₁ -C₁₂ -alkyl, --CO--R¹⁸ or --CO--N(R¹⁶)(R¹⁷), R²¹ is C₁ -C₁₂ -alkyl, phenyl or C₇ -C₁₈ -alkylaryl, R²² is hydrogen, C₁ -C.sub. 12 -alkyl, allyl or benzyl, R²³ is hydrogen, methyl or ethyl, R²⁴ and R^(24a) independently of one another are H or C₁ -C₄ -alkyl, R²⁵ is hydrogen, C₁ -C₁₂ -alkyl, C₃ -C₅ -alkenyl or C₇ -C₁₂ -phenylalkyl, R²⁶ is hydrogen, C₁ -C₁₂ -alkyl, C₃ -C₈ -cycloalkyl or benzyl, and R²⁷ is C₁ -C₁₂ -alkyl, C₅ -C₈ -cycloalkyl or phenyl, or R²⁶ and R²⁷, together with the C atom to which they are attached, form a C₅ -C₁₂ -cycloalkane or C₅ -C₁₂ -alkylcycloalkane ring, or (c) hydrogen, C₁ -C₁₈ -alkyl, C₃ -C₆ -alkenyl, C₇ -C₁₂ -phenylalkyl, C₃ -C₁₂ -alkoxyalkyl or C₃ -C₁₄ -alkoxycarbonylalkyl, R⁴ is hydrogen, C₁ -C₁₈ -alkyl, C₅ -C₈ -cycloalkyl, a group of the formula II, a group of the formula III or IV or a group --C_(m) H_(2m) --COO(C₁ -C₄ -alkyl) and R⁵ is hydrogen, C₁ -C₁₈ -alkyl, C₅ -C₈ -cycloalkyl, phenyl, C₇ -C₉ -phenylalkyl, a group of the formula II, a group of the formula III or IV or a group of the formula V, at least one of the radicals R¹, R², R³, R⁴ and R⁵ containing a sterically hindered phenol group and at least one of these radicals containing a polyalkylpiperidine group.

In these formulae, R¹⁹, R²⁴ and R^(24a) can be C₁ -C₄ -alkyl, for example methyl, ethyl, propyl, isopropyl, n-butyl, sec.-butyl or tert.-butyl. As C₁ 14 C₈ -alkyl, R⁶, R⁷ and R¹⁷ can, in addition, also be, for example, isoamyl, n-hexyl, 2-ethylbutyl, n-octyl or 1,1,3,3-tetramethylbutyl. As C₁ -C₁₂ -alkyl, R⁹, R¹⁰, R¹⁵, R¹⁶, R¹⁸, R²⁰, R²¹, R²², R²⁵ and R²⁶ can, in addition, also be, for example, nonyl, decyl or dodecyl. As C₁ -C₁₈ -alkyl, R¹, R², R³, R⁴ and R⁵ can, in addition, also be, for example, tetradecyl, hexadecyl or octadecyl.

As C₃ -C₁₂ -alkoxyalkyl, R¹, R², R³ and R⁹ can be, for example, 2-methoxyethyl, 2-ethoxyethyl, 2-isopropoxyethyl, 3-methoxypropyl, 2-butoxyethyl, 2-butoxypropyl or 2-hexyloxyethyl. As C₂ -C₁₃ -alkoxymethyl, R¹⁹ can be, for example, methoxymethyl, ethoxymethyl, butoxymethyl, 2-ethylbutoxymethyl, hexyloxymethyl or dodecyloxymethyl.

As C₄ -C₁₂ -dialkylaminoalkyl, R⁹ can be, for example, 2-dimethylaminoethyl, 3-diethylaminopropyl, 2-dipropylaminoethyl or 3-dibutylaminopropyl.

As C₃ -C₁₄ -alkoxycarbonylalkyl, R¹, R² and R³ can be, for example, alkoxycarbonylmethyl, 2-alkoxycarbonylethyl or 2-alkkoxycarbonylpropyl.

As C₃ -C₆ -alkenyl, R¹, R², R³, R¹⁰, R¹⁸ and R²⁵ can be, in particular, C₂ -C₅ -alkenylmethyl, for example allyl, methallyl, 3-methylallyl or 3,3-dimethylallyl. As C₃ -C₄ -alkinyl, R¹⁰ can be, for example, propargyl or 3-methylpropargyl.

As C₅ -C₈ -cycloalkyl, R⁴, R⁵, R⁶, R⁷, R²⁶ and R²⁷ can be, for example, cyclopentyl, cyclohexyl, methylcyclohexyl, dimethylcyclohexyl, cycloheptyl or cyclooctyl. As C₅ -C₁₂ -cycloalkyl, R⁹ and R¹⁸ can, in addition, also be, for example, cyclodecyl or cyclododecyl.

If R²⁶ and R²⁷, together with the C atom to which they are attached, form a cycloalkane or alkylcycloalkane ring, this can be, for example, a cyclopentane, cyclohexane, methylcyclohexane, dimethylcyclohexane, cycloheptane, cyclooctane or cyclododecane ring.

As C₇ -C₉ -phenylalkyl, R⁵, R⁶ and R⁷ can be, for example, benzyl, 2-phenylethyl, 3-phenylpropyl or 1-phenylisopropyl. As C₇ -C₁₂ -phenylalkyl, R¹, R², R³, R¹⁰, R¹⁸ and R²⁵ can, in addition, also be, for example, 3-phenylbutyl or 6-phenylhexyl.

As C₇ -C₁₀ -alkylphenyl, R⁶, R⁷ and R¹⁸ can be, for example, tolyl, xylyl, ethylphenyl, isopropylphenyl or tert.-butylphenyl. As C₇ -C₁₈ -alkylaryl, R²¹ can, in addition, also be, for example, methylnaphthyl, butylnaphthyl, nonylphenyl or dodecylphenyl.

Together with the N atom to which they are attached, R¹⁶ and R¹⁷ can in each case form a 5-membered or 6-membered heterocyclic ring. This can be, for example, a pyrrolidine, piperidine, morpholine or 4-methylpiperazine ring.

In the phenolic radical of the formula II, the hydroxyl group can be in the meta-position or para-position relative to the CH₂ group, but is preferably in the para-position. If the CH₂ group is in the p-position relative to the hydroxyl group, R⁸ is in the m-position. If the CH₂ group is in the m-position, R⁸ is in the p-position relative to the hydroxyl group.

Preferred stabilisers of the formula I are those in which X is a group --N(R³)-- or --C(R⁴)(R⁵)-- and at least one of the radicals R¹, R², R³, R⁴ and R⁵ contains a sterically hindered phenol group and at least one of these radicals contains an N-substituted 2,2,6,6-tetramethylpiperidine group.

Stabilisers of the formula I which are particularly preferred are those in which X is a group --N(R³)-- or --C(R⁴)(R⁵)-- and R¹, R² and R³ independently of one another are either (a) a group of the formula IIa or IIb ##STR10## in which R⁶ is hydrogen, C₁ -C₈ -alkyl, C₅ -C₈ -cycloalkyl or C₇ -C₉ -phenylalkyl and R⁷ is C₁ -C₈ -alkyl, C₅ -C₈ -cycloalkyl or phenyl, or (b) a group of the formula III in which m is 1, 2 or 3, Y is --O-- or --N(R⁹)-- in which R⁹ is hydrogen, C₁ -C₁₂ -alkyl or cyclohexyl or R⁹ is D, D is a group of the formula V in which R is hydrogen and R¹⁰ is C₁ -C₆ -alkyl, allyl, benzyl, C₁ -C₄ -alkyl which is substituted by --CN or --COOR¹⁵, or a group --CO--R¹⁸, --COOR¹⁵, --CON(R¹⁶)(R¹⁷), --CH₂ --CH(R¹⁹)-- OR²⁰, --SOR²¹, --SO₂ R²¹, --OR¹⁵ or --OOC--R¹⁸ in which R¹⁵ is C₁ - C₈ -alkyl, R¹⁶ is C₁ -C₈ -alkyl, cyclohexyl or phenyl and R¹⁷ is hydrogen or C₁ -C₈ -alkyl, or R¹⁶ and R¹⁷, together with the N atom, are pyrrolidine, piperidine or morpholine, R¹⁸ is C₁ -C₄ -alkyl, C₂ -C₃ -alkenyl, cyclohexyl, phenyl or benzyl, R¹⁹ is hydrogen or methyl, R²⁰ is hydrogen, C₁ -C₈ -alkyl or a group of the formula IX ##STR11## in which q is 0, 1 or 2, and R²¹ is C₁ -C₄ -alkyl, phenyl or p-tolyl, or (c) hydrogen, R⁴ and R⁵ independently of one another are hydrogen or C₁ -C₁₂ -alkyl or are as defined under (a) or (b), and at least one of the radicals R¹, R², R³, R⁴ and R⁵ contains a sterically hindered phenol group and at least one of these radicals contains an N-substituted 2,2,6,6-tetramethylpiperidine group.

Compounds of the formula I in which X is a group --N(R³)-- constitute isocyanuric acid esters. Preferred stabilisers within this group are those in which R¹ and R² are a group of the formula IIa in which R⁶ is hydrogen or C₁ -C₄ -alkyl and R⁷ is C₁ -C₄ -alkyl, R³ is a group of the formula III in which m is 1 or 2, Y is --O-- or --N(R⁹)-- in which R⁹ is hydrogen or C₁ -C₁₂ -alkyl or R⁹ is D, and D is a group of the formula V in which R is hydrogen and R¹⁰ is methyl, allyl, benzyl, acetyl, acryloyl, methoxy, ethoxy or --CH₂ CH₂ OR²⁰ in which R²⁰ is hydrogen or a group of the formula IX in which q is 0, 1 or 2 and R⁶ and R⁷ are as defined above.

Compounds of the formula I in which X is a group --C(R⁴)(R⁵)-- constitute barbituric acid derivatives. Preferred stabilisers within this group are those in which R¹ and R² are a group of the formula Ila in which R⁶ is hydrogen or C₁ -C₄ -alkyl and R⁷ is C₁ -C₄ -alkyl, R⁴ is a group of the formula III in which m is 1 or 2, Y is --O-- or --N(R⁹)-- in which R⁹ is hydrogen or C₁ -C₁₂ -alkyl, or R⁹ is D, and D is a group of the formula V in which R is hydrogen and R¹⁰ is methyl, allyl, benzyl, acetyl, acryloyl, methoxy, acetoxy or --CH₂ CH₂ OR²⁰ in which R²⁰ is hydrogen or a group of the formula IX in which q is 0, 1 or 2, R⁶ is hydrogen or C₁ -C₄ -alkyl and R⁷ is C₁ -C₄ -alkyl, and R⁵ is as defined for R⁴ or is C₁ -C₁₂ -alkyl or is as defined for R¹, but particularly those in which R¹ and R² are a group of the formula III in which m is 1 or 2, Y is --O-- or --N(R⁹)-- in which R⁹ is hydrogen or C₁ -C₁₂ -alkyl, or R⁹ is D, and D is a group of the formula V in which R is hydrogen and R¹⁰ is methyl, allyl, benzyl, acetyl, acryloyl, methoxy, acetoxy or --CH₂ CH₂ OR²⁰ in which R²⁰ is hydrogen or a group of the formula IX in which q is 0, 1 or 2, R⁶ is hydrogen or C₁ -C₄ -alkyl and R⁷ is C₁ -C₄ -alkyl, R⁴ is a group of the formula IIa in which R⁶ is R⁷ are as defined above and R⁵ is as defined for R⁴ or is C₁ -C₁₂ -alkyl or is as defined for R¹.

Some of the compounds described herein of the formula I in which X is a group --N(R³)-- are known from German Offenlegungsschrift No. 2,730,397 or U.S. Pat. No. 4,317,911, where their preparation, and also their use as stabilisers for plastics, is described in detail.

Some of the compounds herein described of the formula I in which X is a group --C(R⁴)(R⁵)-- are known from German Offenlegungsschrift No. 2,730,503 or U.S. Pat. No. 4,185,007, where their preparation, and their use in plastics, is also described.

Insofar as the compounds described herein are novel, they can be prepared analogously to the known compounds.

Examples of individual compounds of the formula I in which X is a group --N(R³)-- are those of the following formulae

    __________________________________________________________________________      ##STR12##                                                                         Compound                                                                   No. m     Y       R.sup.10                                                     __________________________________________________________________________     1   1     O       COCHCH.sub.2                                                 2   1     O       CH.sub.3                                                     3   1     O                                                                                       ##STR13##                                                     4 1     O       CON(C.sub.2 H.sub.5).sub.2                                   5   1     NH      COCHCH.sub.2                                                 6   1     NH      COCH.sub.3                                                   7   1     N(C.sub.4 H.sub.9)                                                                     COCH.sub.3                                                     8 2     O                                                                                       ##STR14##                                                     9 2     NH      CH.sub.2 CN                                                  __________________________________________________________________________      ##STR15##                                                                         No.   m =     Y =    R.sup.10 =                                            __________________________________________________________________________     10  1     O       COCHCH.sub.2                                                 11  1     O       CON(C.sub.2 H.sub.5).sub.2                                     12                                                                               1     O                                                                                       ##STR16##                                                     13                                                                               1     O       CH.sub.3                                                     14  1     O       COCH.sub.3                                                   15  1     NH      CH.sub.3                                                     16  2     O       COCHCH.sub.2                                                 17  2     O       OOCCH.sub.3                                                  18  2     N(C.sub.3 H.sub.7)                                                                     COCH.sub.3                                                   __________________________________________________________________________      ##STR17##                                                                     No.                      R.sup.10 =                                            __________________________________________________________________________     19                       CH.sub.3                                              20                       COCHCH.sub.2                                          21                       CH.sub.2 CH.sub.2 OOCCH.sub.3                         __________________________________________________________________________      ##STR18##                                                                         No.                  R.sup.10 =                                            __________________________________________________________________________     22        COCH.sub.3                                                           23        CH.sub.2 CHCH.sub.2                                                  __________________________________________________________________________      ##STR19##                                                                         No.                  Z =                                                   __________________________________________________________________________     24                                                                                        ##STR20##                                                           __________________________________________________________________________

Examples of compounds of the formula I in which X is a group --C(R⁴)(R⁵)-- are those of the following formulae:

    __________________________________________________________________________      ##STR21##                                                                     No.       m =        R.sup.10 =                                                __________________________________________________________________________     24        1          CH.sub.3                                                  26        1          COCHCH.sub.2                                              27        2          CH.sub.2 CHCH.sub.2                                         28      1                                                                                          ##STR22##                                                  29      2          CH.sub.3                                                  __________________________________________________________________________      ##STR23##                                                                     No.       A =        R.sup.10 =                                                __________________________________________________________________________     30        CH.sub.2   COCHCH.sub.2                                              31        CH.sub.2 CH.sub.2                                                                         CH.sub.3                                                  32        CH(CH.sub.3)CH.sub.2                                                                      COCH.sub.3                                                33        CH(CH.sub.3)CH.sub.2                                                                      CH.sub.3                                                  __________________________________________________________________________      ##STR24##                                                                     No.                  R.sup.10 =                                                __________________________________________________________________________     34        COCH.sub.3                                                           35                   CH.sub.3                                                  __________________________________________________________________________     No. 36                                                                              ##STR25##                                                                 __________________________________________________________________________      ##STR26##                                                                     No.                  R.sup.1 = R.sup.2 = R.sup.4 =                             __________________________________________________________________________     37                                                                                                   ##STR27##                                                __________________________________________________________________________     No. 38                                                                              ##STR28##                                                                 __________________________________________________________________________

The stabilisers of the formula I can be incorporated in a known manner into a photographic material on their own or together with other compounds.

As a rule, the stabilisers are incorporated into the photographic material on their own or together with other compounds, particularly with the colour couplers, in the form of a dispersion, this dispersion either containing no solvent or high-boiling or low-boiling solvents or a mixture of such solvents. A further suitable mode of incorporation consists in incorporating the stabilisers, on their own or together with further compounds, together with a polymer in the form of a latex into the photographic material.

The dispersions are then used to prepare the layers of colour-photographic recording materials. These layers can be, for example, intermediate layers or protective layers, but particularly light-sensitive (blue-, green- and red-sensitive) silver halide emulsion layers, in which the blue-green (cyan) dyes, purple (magenta) dyes and yellow dyes are formed from the appropriate colour couplers when the exposed recording material is developed.

The silver halide layers can contain any desired colour couplers, particularly blue-green, purple and yellow couplers, which are used to form the said dyes and thus the dye images.

Since the substrate affects the action and stability of the stabilisers, preferred substrates (solvents or polymers) are those which, together with the stabilisers, produce the best possible stability in the materials to be stabilised.

As a rule, the stabilisers are incorporated into layers containing, in addition, a silver halide dispersion which has been prepared and sensitised by conventional methods. They can, however, also be present in layers which are adjacent to layers containing silver halide.

The photographic materials according to the invention have a conventional composition and contain components which enhance, or at least do not adversely affect, the activity of the stabilisers.

In the photographic recording material according to the present invention, the stabilisers of the formula I can be combined in the same layer not only with the colour couplers, but also, in addition, with ultraviolet absorbers or other light stabilisers.

If the diffusion transfer method is used, the stabiliser can also be incorporated in a receiving layer.

The colour-photographic materials according to the invention can be processed in a known manner. Furthermore, they can be treated in the course of, or after, processing in a manner which increases their stability further, for example by treatment in a stabiliser bath or by the application of a protective coating.

In certain cases, the stabilisers which can be employed in accordance with the invention are also suitable for protecting colour-photographic layers in which the dyes are directly incorporated in the emulsion and the image is produced by selective bleaching.

The amount of the stabiliser or stabilisers can vary within wide limits and is approximately within the range from 1 to 2,000 mg, preferably 100 to 800 and, in particular, 200-500 mg, per m² of the layer in which it (they) is (are) incorporated.

If the photographic material contains one or more UV absorbers, the latter can be present together with the stabiliser in one layer or can also be present in an adjacent layer. The amount of UV absorber can vary within wide limits and is approximately within the range from 200 to 2,000 mg, preferably 400-1,000 mg, per m² of layer. Examples of suitable UV absorbers are those of the benzophenone, acrylonitrile, thiazolidone, benztriazole, oxazole, thiazole and imidazole type.

The colour images obtained with the recording material according to the invention by exposure and development have a very good light-fastness towards visible and ultraviolet light. The compounds of the formula I are virtually colourless, so that no discolouration of the images results; in addition, they are readily compatible with the customary photographic additives present in the individual layers. By virtue of their good activity, it is possible to reduce the quantity of them employed and thus to prevent them from being precipitated or crystallising out if they are incorporated as an organic solution into the aqueous binder emulsions which are used for the preparation of photographic layers. The individual processing stages required, after the exposure of the photographic recording material, for the production of the colour images are not adversely affected by the stabilisers of the formula I. Furthermore, the so-called formation of abrasion fogging which frequently occurs with blue-sensitive emulsions is substantially repressed. This can occur, for example, if mechanical stresses, for example twisting, bending or rubbing, are exerted on photographic materials (silver halide emulsion layers located on a base composed of natural or synthetic materials) while they are being prepared or treated before being developed. (T. H. James, The Theory of Photographic Process, 4th edition, Macmillan, New York, NY 1977, pages 23 et seq and 166 et seq).

EXAMPLE

0.087 g of the yellow coupler of the formula ##STR29## and 0.026 g of one of the stabilisers indicated in the Table below are dissolved in 2.0 ml of a mixture of tricresyl phosphate and ethylacetate (1.5 g in 100 ml). 7.0 ml of a 6% gelatin solution, 0.5 ml of an 8% solution of the wetting agent of the formula ##STR30## in isopropanol/water (3:4) and 0.5 ml of water are added to this solution, and the mixture is emulsified by ultrasonic means at an input of 100 watts for 5 minutes.

2.0 ml of a silver bromide emulsion having a silver content of 6.0 g per liter, 0.7 ml of a 1% aqueous solution of the hardener of the formula ##STR31## and 3.8 ml of water are added to 2.5 ml of the emulsion thus obtained, the pH of the mixture is adjusted to a value of 6.5 and is coated onto a subbed, plastic-coated, white sheet of paper, mounted on a glass plate.

After the mixture has solidified, it is dried at room temperature in a circulating air drying cabinet.

After 7 days, samples cut to dimensions of 35×180 mm are exposed at 3,000 lux.second behind a stepped wedge and are then processed by the Kodak Ektaprint® 2-staged process.

The yellow wedges thus obtained are irradiated at a total of 42 kJoules/cm² in an Atlas weather-ometer using a 2,500 watt xenon lamp (a comparison sample contains no light stabiliser). The loss of colour density thereby occasioned is determined by measuring the colour density at λ_(max) using a densitometer (TR 924 A made by Macbeth).

The results are shown in the Table below.

    ______________________________________                                         Stabiliser     Percentage loss of                                              Compound No.   colour density                                                  ______________________________________                                          1             20                                                               3             22                                                               4             21                                                               5             22                                                              12             20                                                              13             16                                                              14             20                                                              20             22                                                              without stabiliser                                                                            36                                                              ______________________________________                                     

What we claim is:
 1. A colour-photographic recording material which, in at least one light-sensitive silver halide emulsion layer, one intermediate layer, one image-receiving layer and/or one protective layer, contains, as a stabiliser, a light stabilising amount of at least one compound of the formula I ##STR32## in which X is a group ##STR33## and R¹, R², R³, R⁴ and R⁵ are monovalent organic radicals, at least one of which contains a sterically hindered phenol group and at least one of which contains a polyalkylpiperidine group.
 2. A colour-photographic recording material according to claim 1, containing at least one compound of the formula I in which X is a group --N(R³)-- or --C(R⁴)(R⁵)--, R¹, R² and R³ independently of one another are either (a) a group of the formula II ##STR34## in which R⁶ is hydrogen, C₁ -C₈ -alkyl, C₅ -C₈ -cycloalkyl, C₇ -C₉ -phenylalkyl, phenyl or C₇ -C₁₀ -alkylphenyl, R⁷ is C₁ -C₈ -alkyl, C₅ -C₈ -cycloalkyl, C₇ -C₉ -phenylalkyl, phenyl or C₇ -C₁₀ -alkylphenyl, and R⁸ is hydrogen or methyl, or (b) a group of the formula III or IV

    --C.sub.m H.sub.2m --CO--Y--D                              (III)

    --C.sub.m H.sub.2m --CO--O--C.sub.n H.sub.2n --E           (IV)

in which m is 1-4 and n is 2-5, Y is --O-- or --NR⁹ -- and R⁹ is hydrogen, C₁ -C₁₂ -alkyl, C₅ -C₁₂ -cycloalkyl, C₃ -C₁₂ -alkoxyalkyl, C₄ -C₁₂ -dialkylaminoalkyl or a group of the formula ##STR35## in which p is 2-12, or R⁹ is D, D is a group of the formula V, VI or VIII ##STR36## and E is a group of the formula VIII ##STR37## in which R is hydrogen or methyl, R¹⁰ is hydroxyl, C₁ -C₁₂ -alkyl, C₃ -C₆ -alkenyl, C₃ -C₄ -alkinyl, C₇ -C₁₂ -phenylalkyl, glycidyl, C₁ -C₄ -alkyl which is substituted by halogen, --CN, --COOR¹⁵ or --CON(R¹⁶)(R¹⁷), or a group --CO--R¹⁸ --CO--OR¹⁵, --CO--N(R¹⁶ (R¹⁷), --CH₂ --CH(R¹⁹)--OR²⁰, --SO--R²¹, --SO₂ --R²¹, --OR¹⁵ or --OOC--R¹⁸, R¹¹ is methyl or ethyl, R¹² is hydrogen, --OR²², --OOC--R¹⁸ or --N(R⁹)--CO--R¹⁸ and R¹³ is hydrogen, --CN, --COOR¹⁵ or --CONH₂ or R¹² and R¹³ together form a group of the following formulae ##STR38## R¹⁵ is C₁ -C₁₂ -alkyl, allyl, benzyl or cyclohexyl, R¹⁶ is C₁ -C₁₂ -alkyl, allyl, cyclohexyl, benzyl or phenyl, and R¹⁷ is hydrogen or C₁ -C₈ -alkyl, or R¹⁶ and R¹⁷, together with the N atom, are a 5-membered or 6-membered heterocyclic ring, R¹⁸ is hydrogen, C₁ -C₁₂ -alkyl, C₂ -C₆ -alkenyl, chloromethyl, C₅ -C₁₂ -cycloalkyl, C₇ -C₁₂ -phenylalkyl, phenyl, C₇ -C₁₀ -alkylphenyl or phenyl, phenylmethyl or phenylethyl which is substituted by one or two C₁ -C₄ -alkyl groups and a hydroxyl group, R¹⁹ is hydrogen, C₁ -C₄ -alkyl, C₂ -C₁₃ -alkoxymethyl, phenyl or phenoxymethyl, R²⁰ is hydrogen, C₁ -C₁₂ -alkyl, --CO--R¹⁸ or --CO--N(R¹⁶)(R¹⁷), R²¹ is C₁ -C₁₂ -alkyl, phenyl or C₇ -C₁₈ -alkylaryl, R²² is hydrogen, C₁ -C₁₂ -alkyl, allyl or benzyl, R²³ is hydrogen, methyl or ethyl, R²⁴ and R^(24a) independently of one another are H or C₁ -C₄ -alkyl, R²⁵ is hydrogen, C₁ -C₁₂ -alkyl, C₃ -C₆ -alkenyl or C₇ -C₁₂ -phenylalkyl, R²⁶ is hydrogen, C₁ -C₁₂ -alkyl, C₃ -C₈ -cycloalkyl or benzyl, and R²⁷ is C₁ -C₁₂ -alkyl, C₅ -C₈ -cycloalkyl or phenyl, or R²⁶ and R²⁷, together with the C atom to which they are attached, form a C₅ -C₁₂ -cycloalkane or C₅ -C₁₂ -alkylcycloalkane ring, or (c) hydrogen, C₁ -C₁₈ -alkyl, C₃ -C₆ -alkenyl, C₇ -C₁₂ -phenylalkyl, C₃ -C₁₂ -alkoxyalkyl or C₃ -C₁₄ -alkoxycarbonylalkyl, R⁴ is hydrogen, C₁ -C₁₈ -alkyl, C₅ -C₈ -cycloalkyl, a group of the formula II, a group of the formula III or IV or a group --C_(m) H_(2m) --COO(C₁ -C₄ -alkyl) and R⁵ is hydrogen, C₁ -C₁₈ -alkyl, C₅ -C₈ -cycloalkyl, phenyl, C₇ -C₉ -phenylalkyl, a group of the formula II, a group of the formula III or IV or a group of the formula V, at least one of the radicals R¹, R², R³, R⁴ and R⁵ containing a sterically hindered phenol group and at least one of these radicals containing a polyalkylpiperidine group.
 3. A colour-photographic recording material according to claim 1, containing at least one compound of the formula I in which X is a group --N(R³)-- or --C(R⁴)(R⁵)--, and at least one of the radicals R¹, R², R³, R⁴ and R⁵ contains a sterically hindered phenol group and at least one of the radicals contains an N-substituted 2,2,6,6-tetramethylpiperidine group.
 4. A colour-photographic recording material according to claim 2, containing a compound of the formula I in which X is a group --N(R³)-- or --(R⁴)(R⁵)--, and R¹, R² and R³ independently of one another are either (a) a group of the formula IIa or IIb ##STR39## in which R⁶ is hydrogen, C₁ -C₈ -alkyl, C₅ -C₈ -cycloalkyl or C₇ -C₉ -phenylalkyl and R⁷ is C₁ -C₈ -alkyl, C₅ -C₈ -cycloalkyl or phenyl, or (b) a group of the formula III in which m is 1, 2 or 3, Y is --O-- or --N(R⁹)-- in which R⁹ is hydrogen, C₁ -C₁₂ -alkyl or cyclohexyl or R⁹ is D, D is a group of the formula V in which R is hydrogen and R¹⁰ is C₁ -C₆ -alkyl, allyl, benzyl, C₁ -C₄ -alkyl which is substituted by --CN or --COOR¹⁵, or a group --CO--R¹⁸, --COOR¹⁵, --CON(R¹⁶)(R¹⁷), --CH₂ --CH(R¹⁹)--OR²⁰, --SOR²¹, --SO₂ R²¹, --OR¹⁵ or --OOC--R¹⁸ in which R¹⁵ is C₁ -C.sub. 8 -alkyl, R¹⁶ is C₁ -C₈ -alkyl, cyclohexyl or phenyl and R¹⁷ is hydrogen or C₁ -C₈ -alkyl, or R¹⁶ and R¹⁷, together with the N atom, are pyrrolidine, piperidine or morpholine, R¹⁸ is C₁ -C₄ -alkyl, C₂ -C₃ -alkenyl, cyclohexyl, phenyl or benzyl, R¹⁹ is hydrogen or methyl, R²⁰ is hydrogen, C₁ -C₈ -alkyl or a group of the formula IX ##STR40## in which q is 0, 1 or 2, and R²¹ is C₁ -C₄ -alkyl, phenyl or p-tolyl, or (c) hydrogen, R⁴ and R⁵ independently of one another are hydrogen or C₁ -C₁₂ -alkyl or are as defined under (a) or (b), and at least one of the radicals R¹, R², R³, R⁴ and R⁵ contains a sterically hindered phenol group and at least one of these radicals contains an N-substituted 2,2,6,6-tetramethylpiperidine group.
 5. A colour-photographic recording material according to claim 4, containing a compound of the formula I in which X is a group --N(R³)--, in which R¹ and R² are a group of the formula IIa in which R⁶ is hydrogen or C₁ -C₄ -alkyl and R⁷ is C₁ -C₄ -alkyl, R³ is a group of the formula III in which m is 1 or 2, Y is --O-- or --N(R⁹)-- in which R⁹ is hydrogen or C₁ -C₁₂ -alkyl or R⁹ is D, and D is a group of the formula V in which R is hydrogen and R¹⁰ is methyl, allyl, benzyl, acetyl, acryloyl, methoxy, ethoxy or --CH₂ CH₂ OR²⁰ in which R²⁰ is hydrogen or a group of the formula IX in which q is 0, 1 or 2 and R⁶ and R⁷ are as defined above.
 6. A colour-photographic recording material according to claim 4, containing a compound of the formula I in which X is a group --C(R⁴)(R⁵)--, R¹ and R² are a group of the formula IIa in which R⁶ is hydrogen or C₁ -C₄ -alkyl and R⁷ is C₁ -C₄ -alkyl, R⁴ is a group of the formula III in which m is 1 or 2, Y is --O-- or --N(R⁹)-- in which R⁹ is hydrogen or C₁ -C₁₂ -alkyl, or R⁹ is D, and D is a group of the formula V in which R is hydrogen and R¹⁰ is methyl, allyl, benzyl, acetyl, acryloyl, methoxy, acetoxy or --CH₂ CH₂ OR²⁰ in which R²⁰ is hydrogen or a group of the formula IX in which q is 0, 1 or 2, R⁶ is hydrogen or C₁ -C₄ -alkyl and R⁷ is C.sub. 1 -C₄ -alkyl, and R⁵ is as defined for R⁴ or is C₁ -C₁₂ -alkyl or is as defined for R¹.
 7. A colour-photographic recording material according to claim 4, containing a compound of the formula I in which X is a group --C(R⁴)(R⁵)--, R¹ and R² are a group of the formula III in which m is 1 or 2, Y is --O-- or --N(R⁹)-- in which R⁹ is hydrogen or C₁ -C₁₂ -alkyl, or R⁹ is D, and D is a group of the formula V in which R is hydrogen and R¹⁰ is methyl, allyl, benzyl, acetyl, acryloyl, methoxy, acetoxy or --CH₂ CH₂ OR²⁰ in which R²⁰ is hydrogen or a group of the formula IX in which q is 0, 1 or or 2, R⁶ is hydrogen or C₁ -C₄ -alkyl and R⁷ is C₁ -C₄ -alkyl, R⁴ is a group of the formula IIa in which R⁶ and R⁷ are as defined above and R⁵ is as defined for R⁴ or is C₁ -C₁₂ -alkyl or is as defined for R¹.
 8. A colour-photographic recording material according to claim 1, which, in addition to a stabiliser of the formula I contains a light stabiliser belonging to the class comprising the ultraviolet absorbers.
 9. A colour-photographic recording material according to claim 1, which contains 1 to 2,000 mg per m² of a compound of the formula I.
 10. A colour-photographic recording material according to claim 9 which contains 100 to 800 mg per m² of a compound of the formula I. 